USOS Y POSIBILIDAD DE CULTIVO DE LA SAYA (Amoreuxia spp.) EN EL NOROESTE DE MÉXICO

Saya (Amoreuxia spp.) was a plant consumed by ethnic groups in the past and by the first colonizers, but even today, in regions of the northwest of Mexico it is still consumed. Two species of the genus Amoreuxia are listed in NOM-O59- SEMARNAT-2010: A. palmatifida and A. wrightii. Despite the recognition for several decades of its potential as a food, as fodder for fauna or domestic livestock, its importance in the functioning of the ecosystem, its medicinal use and possible ornamental use; Many aspects of propagation, growth and productivity under the agronomic management of the saya are unknown. In this work the results of growth and productivity of A. palmatifida are shown under experimental botanical garden soil with drip irrigation. Extrapolating our results to agricultural conditions, we estimate a productivity of 20,000 tuberous saya roots per hectare and 3,100,000 seeds per hectare. With these results we can think that it is viable germination and production strategies in agricultural plots with drip irrigation, previous obtaining of the corresponding permits on the SEMARNAT, which could allow obtaining propagules, both from tuberous roots and saya seeds, to be used in the ecological restoration of degraded lands or for harvesting programs as a new crop.En el pasado, la saya (Amoreuxia spp.) fue una planta consumida por los grupos originarios del noreste de México y por los primeros colonizadores, y aun hoy en día, se sigue consumiendo en esta región. Dos especies del género Amoreuxia se encuentran enlistadas en la NOM-O59- SEMARNAT-2010: A. palmatifida y A. wrightii. A pesar del reconocimiento desde hace varias décadas de su potencial como alimento, como forraje para fauna o ganado doméstico, de su importancia en el funcionamiento del ecosistema, de su uso medicinal y posible uso ornamental, se desconocen muchos aspectos de la propagación, crecimiento y productividad bajo manejo agronómico de la saya. En este trabajo se muestran los resultados de crecimiento y productividad de A. palmatifida bajo suelo de jardín botánico experimental con riego por goteo. Extrapolando nuestros resultados a condiciones agrícolas, estimamos una productividad de 20,000 raíces tuberosas de saya por hectárea y 3,100,000 semillas por hectárea. Con estos resultados podemos pensar en que es viable estrategias de germinación y producción en parcelas agrícolas con riego por goteo, previa obtención de los permisos correspondientes ante la SEMARNAT, que podrían permitir la obtención de propágulos, tanto de raíces tuberosas como semillas de saya, para utilizarse en la restauración ecológica de terrenos degradados ó para programas de aprovechamiento como un nuevo cultivo

Carbon and water fluxes in an exotic buffelgrass savanna

Buffelgrass savanna is becoming widespread in aridland ecosystems around the world following invasion or deliberate land conversion for cattle forage. There is still a gap of information regarding functional and ecohydrological aspects such as carbon, water, and greenhouse gas exchanges in these highly productive novel ecosystems where buffelgrass is an exotic species. We measured net ecosystem CO2 exchange (NEE), ecosystem respiration (Reco), gross primary production (GPP), and evapotranspiration (ET) with eddy covariance techniques over a buffelgrass savanna established for cattle grazing, approximately 30 yr ago within the Sonoran Desert. The savanna was a net carbon sink (NEE -230 g C/m2/yr) during both a year with above average and one with below-average precipitation (NEE -84 g C/m2/yr). Water loss through evapotranspiration (ET) was similar to total annual rainfall input. Up to 62% of the annual fixed carbon and 75% of ET occurred during the summer monsoon season, when 72-86% of annual rainfall occurred and buffelgrass was active. ET from summer months explained 73% of variation in NEE, with an average ET of 50 mm H2O/month needed to turn the ecosystem into a net carbon sink during this season. Other seasons in the year, when buffelgrass was dormant, contributed with up to 48% of annual fixed carbon but with higher water use efficiency (-NEE/ET). Wediscuss the importance of the seasonal variability in Reco, GPP, and ET processes and the phenology of native plant species for the net carbon uptake through the year for this managed novel ecosystem. © 2016 The Society for Range Management. Published by Elsevier Inc. All rights reserved.The Rangeland Ecology & Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information

La construcción de la Hacienda hispánica en el largo siglo XVIII: una investigación en curso

Dossier monographiqueInternational audienc

Encyclopédie des historiographies : Afriques, Amériques, Asies

Quels rapports les sociétés humaines entretiennent-elles avec leur passé et quels récits font-elles du temps révolu ? Pour ce premier volume de l’Encyclopédie des historiographies. Afriques, Amériques, Asies, 157 spécialistes représentant 88 institutions académiques en France et dans le monde explorent l’univers des productions humaines qui constituent des sources pour l’historien et déchiffrent les nombreuses modalités (« scientifiques », littéraires, artistiques, monumentales…) de l’écriture du passé. Évoquant tour à tour l’Afrique, l’Amérique latine, l’Asie, l’Océanie, les 216 notices de l’ouvrage présentent des matériaux historiques de toute nature, issus de toutes les époques, souvent méconnus, ainsi que l’histoire de leurs usages. L’entreprise collective qu’est l’Encyclopédie se veut novatrice : il s’agit de susciter une réflexion historiographique résolument non-occidentalo-centrée qui complète utilement les démarches épistémologiques traditionnelles. Nouvel outil de connaissance historique forgé à l’heure de la mondialisation, l’Encyclopédie des historiographies est aussi une véritable invitation au voyage.What are the different types of relations that non-Western societies upkeep with their past and how are narratives about the past produced by them? In this first volume of the Encyclopaedia of Historiography: Africa, America, Asia, 157 specialists from 88 international academic institutions explore the wealth of evidence that constitutes source material for historians. They also examine the immensely diverse modes or genres of narrated history: “scientific”, literary, artistic, architectural, etc. 216 entries dealing with Africa, Latin America, Oceania, and Asia, cover a large variety of sources, including many which are unfamiliar to the Western or non-Western reader, along with the history of how they have been exploited. By bringing together for the first time such an abundance of material the reader is offered the possibility of exploring continents and building meaningful connections across space and time. In addition to being a new tool for historical enquiry in an era of globalization, this encyclopaedia is also an invitation to travel the world